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一.心血管系统方面(一)心动过缓是最常见的反应。β阻滞剂常用于治疗窦性心动过速,故使窦性心率减慢实为它的治疗作用。用药后如心率减慢但在50次/分以上,且无心功能受抑制的表现,可不必停药。但如心率慢于50次/分,发生窦房阻滞或窦性暂停者,则以停药为宜。伴有症状者可静脉注射阿托品1～2mg,静脉滴注异丙肾上腺素1～(?)0μg/kg/mi(?),多巴酚丁胺15μg/kg/mi(?)或多巴胺6～15μg/kg/min 以增快心率。也可用胰高血糖素滴注(2.5～7.5μg/kg/min)对抗。原有窦性心动过缓的病人一般不宜用β阻滞剂。(二)房室传导阻滞并不常见,用心得安的病人其发生率在1‰左右。其处理与窦性心动过缓相仿,必要时用临时性人工心脏起
A cardiovascular system (a) bradycardia is the most common reaction. Beta blockers are commonly used in the treatment of sinus tachycardia, so the slow sinus heart rate is actually its therapeutic effect. If the heart rate after treatment but slowed down at 50 beats / min or more, and no inhibition of cardiac function performance may not need to stop. However, if the heart rate slower than 50 beats / min, sinus block or sinus pause occurs, the withdrawal is appropriate. Patients with symptoms can be intravenous injection of atropine 1 ~ 2mg, intravenous infusion of isoproterenol 1 ~ (?) 0μg / kg / mi (?), Dobutamine 15μg / kg / mi (?) Or dopamine 6 ~ 15μg / kg / min to speed up the heart rate. Can also be used glucagon infusion (2.5 ~ 7.5μg / kg / min) confrontation. The original sinus bradycardia patients generally should not use beta blockers. (B) atrioventricular block is not common, patiently worried about the incidence of its 1 ‰. Its treatment and sinus bradycardia similar, if necessary, with a temporary artificial heart